This model uses an 18-volt, lithium-ion battery-powered motor that retracts the driver piston and compresses the air behind it. Pulling the trigger releases the piston, driving the fastener. And it does all this in a package that weighs a little more than 6 pounds. I used the Fusion F15 to install wainscoting on my stairwell, and quickly appreciated how nimble it is. The nose pinpoints nail placement with clear visibility thanks to an LED light. It won’t bump-fire as quickly as my pneumatic nailers, but I found it plenty quick enough. And for clearing nail jams, the entire magazine comes off with the release of a lever. (The nailer never jammed on me, but it’s good to know there’s an easy fix if it should.) The F15 comes with one battery, and it drives 330 nails per charge. But you must remove the battery pack from the tool or turn the firing-mode selector switch to its “off” position to avoid depleting the battery when sitting idle overnight. The 15-gauge nails have lots of holding power but leave larger holes than I’d like. —Tested by Kevin Boyle